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Contribution of individual histidines to prion protein copper binding


Reference:

Davies, P., McHugh, P. C., Hammond, V. J., Marken, F. and Brown, D. R., 2011. Contribution of individual histidines to prion protein copper binding. Biochemistry, 50 (50), pp. 10781-10791.

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Official URL:

http://dx.doi.org/10.1021/bi2012349

Abstract

The prion protein is well-established as a copper binding protein. The N-terminus of the protein contains an octameric repeat region with each of the four repeats containing a histidine. The N-terminus has two additional histidines distal to the repeat region that has been commonly known as the fifth site. While binding of copper by the protein has been extensively studied, the contribution of each histidine to copper binding in the full-length protein has not. Here we used a battery of mutants of the recombinant mouse prion protein to assess copper binding with both isothermal titration calorimetry and cyclic voltammetry. The findings indicate that there is extensive cooperativity between different binding sites in the protein. The two highest-affinity binding events occur at the fifth site and at the octameric repeat region. However, the first binding is that to the octameric repeat region. Subsequent binding events after the two initial binding events have lower affinities within the octameric repeat region.

Details

Item Type Articles
CreatorsDavies, P., McHugh, P. C., Hammond, V. J., Marken, F. and Brown, D. R.
DOI10.1021/bi2012349
DepartmentsFaculty of Science > Chemistry
RefereedYes
StatusPublished
ID Code28114

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